Want to replace Subscribe option with Unsubscribe

After activating “Allow users to subscribe to forums and topics” we see subscribe option by default so that interested user can subscribe.

But what I want is an unsubscribe option by default in place of subscribe after activating “Allow users to subscribe to forums and topics”. So that by default every user receive notifications for new posts and replies as they will be treated as subscribed by default. Every user will have unsubscribe option so that if they want to unsubscribe from the post they can any time.

But still my personal preference is for a single configurable tool (bbPress in this case) rather than a proliferation of different plugins.

In particular I am always uncomfortable using plugins that have no reviews. In this case I took a chance as I have seen other work by it’s author. I have now added a review for him, so at least there is no one!